STOCKHOLM -- Telefon AB L.M. Ericsson said its supply contracts for Cingular Wireless's network upgrade will likely be worth about $2 billion, while Nokia Corp. said its share of the deal is worth more than $1 billion.

Cingular, the second-largest U.S. wireless carrier, is converting its nationwide network to a standard known as the global system for mobile communications, or GSM, which is the basis for about two-thirds of the world's...